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Accrued maintenance liability (Tables)
6 Months Ended
Jun. 30, 2022
Accrued Maintenance Liability [Abstract]  
Schedule of movements in accrued maintenance liability
Movements in accrued maintenance liability during the six months ended June 30, 2022 and 2021 were as follows:
Six Months Ended June 30,
20222021
Accrued maintenance liability at beginning of period$2,900,651 $1,750,395 
Maintenance payments received353,522 163,280 
Maintenance payments returned(172,570)(91,957)
Release to income upon sale(14,079)(13,587)
Release to income other than upon sale (a)(698,429)(140,047)
Lessor contribution, top-ups and other (a)(53,627)(19,887)
Accrued maintenance liability at end of period$2,315,468 $1,648,197 
(a)Accrued maintenance liability released to income other than upon sale and lessor contribution, top-ups and other for the six months ended June 30, 2022 included amounts related to the Ukraine Conflict. Refer to Note 5—Net charges related to Ukraine Conflict for further details.